You're in the right century, but I was thinking of a true heavy duty arctic breaker. Quoting from the same article you cited, "At the beginning of the 20th century, several countries began to operate purpose-built icebreakers. Most were coastal icebreakers, but Russia, and later, the Soviet Union, also built several oceangoing icebreakers of around 10,000 ton displacement."
I am looking for the first "purpose-built" breaker.
Quoting one source, she was "often referred to as the world's first true icebreaker, with a strengthened hull shaped to ride over and crush pack ice".
Quoting a second source, "She was 10,000 tons and 10,000 horsepower, with four screws: three aft and another forward. With 1 1/2 inch plating at the waterline, she became the prototype of icebreakers to come".